In the Storm textures TechSigns already have a normal and specular. You can change these by making a mod but the TechSigns diffuse can be used on it's own in the folder specified and can also have a loc file so everyone sees it (I have tested loc file and works). I don't think normals and speculars will be able to be shared like this.
It was the same in stadium, you could make a sign but you still could see the normal and specular for the original sign.
I think it's a nice feature even tho you can't change the normal and specular.
Did I mention normal and specular to many times?
![This cracks me up :roflol:](./images/smilies/icon_roflol.gif)